设置 <UITouch> 在 iOS Swift 游戏中不工作

Question

我正在 Xcode v7.0 中使用 Swift 2.0 制作一款类似于 Fruit Ninja 的游戏。但是，在 touchesBegan、touchesMoved 和 touchesCancelled 覆盖函数中，我收到以下三个错误：

"Value of type 'Set' has no member 'anyObject'" 出现两次并且 "Value of optional type 'Set' not unwrapped; did you mean to use "！”或“？？”来一次

这是代码

override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
    let touch = touches.anyObject() as UITouch
    let location = touch.locationInNode(self)

    activeSlicePoints.append(location)
    redrawActiveSlice()

    activeSliceBG.removeAllActions()
    activeSliceFG.removeAllActions()

    activeSliceBG.alpha = 1
    activeSliceFG.alpha = 1

}

override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent?) {
    let touch = touches.anyObject() as UITouch
    let location = touch.locationInNode(self)

    activeSlicePoints.append(location)
    redrawActiveSlice()

}

override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent?) {
    activeSliceBG.runAction(SKAction.fadeOutWithDuration(0.25))
    activeSliceFG.runAction(SKAction.fadeOutWithDuration(0.25))

}

override func touchesCancelled(touches: Set<UITouch>?, withEvent event: UIEvent?) {
    touchesEnded(touches, withEvent: event)
}

Here is an image of on what lines the errors appear

感谢所有帮助。提前致谢。

Answer 1

let touch =  touches.first as? UITouch

这将为您提供第一个触摸对象。

像这样使用它：

override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
    if let touch = touches.first {
        // ...
    }
    super.touchesBegan(touches, withEvent:event)
}

设置 <UITouch> 在 iOS Swift 游戏中不工作

Set<UITouch> not working in iOS Swift game

ios

swift

touchesbegan

touchesmoved